From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39800) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRfyY-0007CC-13 for qemu-devel@nongnu.org; Fri, 05 Feb 2016 07:59:02 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aRfyU-0005D5-Qk for qemu-devel@nongnu.org; Fri, 05 Feb 2016 07:59:01 -0500 Received: from mx1.redhat.com ([209.132.183.28]:4048) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRfyU-0005Ct-Kl for qemu-devel@nongnu.org; Fri, 05 Feb 2016 07:58:58 -0500 Date: Fri, 5 Feb 2016 13:58:54 +0100 From: Igor Mammedov Message-ID: <20160205135854.0d0e6fae@nial.brq.redhat.com> In-Reply-To: <1454660341-45244-6-git-send-email-vsementsov@virtuozzo.com> References: <1454660341-45244-1-git-send-email-vsementsov@virtuozzo.com> <1454660341-45244-6-git-send-email-vsementsov@virtuozzo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 5/5] balloon: Use only 'pc-dimm' type dimm for ballooning List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Vladimir Sementsov-Ogievskiy Cc: guangrong.xiao@linux.intel.com, mst@redhat.com, qemu-devel@nongnu.org, armbru@redhat.com, stefanha@redhat.com, cornelia.huck@de.ibm.com, den@openvz.org, lcapitulino@redhat.com On Fri, 5 Feb 2016 11:19:01 +0300 Vladimir Sementsov-Ogievskiy wrote: > For now there are only two dimm's: pc-dimm and nvdimm. This patch is > actually needed to disable ballooning on nvdimm. But, to avoid future > bugs, instead of disallowing nvdimm, we allow only pc-dimm. So, if > someone adds new dimm which should be balloon-able, then this ability > should be explicitly specified here. > > Why ballooning for nvdimm should be disabled for now: > > NVDIMM for now is planned to use as a backing store for DAX filesystem > in the guest and thus this memory is excluded from guest memory > management and LRUs. > > In this case libvirt running QEMU along with configured balloon almost > immediately inflates balloon and effectively kill the guest as > qemu counts nvdimm as part of the ram. > > Counting dimm devices as part of the ram for ballooning was started from > commit 463756d03: > virtio-balloon: Fix balloon not working correctly when hotplug memory > > Signed-off-by: Vladimir Sementsov-Ogievskiy > Signed-off-by: Denis V. Lunev > --- > hw/virtio/virtio-balloon.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c > index b9c1964..0415e07 100644 > --- a/hw/virtio/virtio-balloon.c > +++ b/hw/virtio/virtio-balloon.c > @@ -18,6 +18,7 @@ > #include "qemu-common.h" > #include "hw/virtio/virtio.h" > #include "hw/i386/pc.h" > +#include "hw/mem/nvdimm.h" Is this include still needed? > #include "cpu.h" > #include "sysemu/balloon.h" > #include "hw/virtio/virtio-balloon.h" > @@ -302,7 +303,10 @@ static ram_addr_t get_current_ram_size(void) > pc_dimm_build_list(qdev_get_machine(), &list); > for (item = list; item; item = g_slist_next(item)) { > PCDIMMDevice *dimm = item->data; > - size += object_property_get_int(OBJECT(dimm), PC_DIMM_SIZE_PROP, NULL); > + if (!strcmp(object_get_typename(OBJECT(dimm)), TYPE_PC_DIMM)) { > + size += object_property_get_int(OBJECT(dimm), PC_DIMM_SIZE_PROP, > + NULL); > + } > } > g_slist_free(list); >